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Debris sensing based on LEO constellation: an intersatellite channel parameter estimation approach

DOI:
10.60864/qbn5-2e31
Citation Author(s):
Submitted by:
Yuan Liu
Last updated:
6 June 2024 - 10:54am
Document Type:
Presentation Slides
Document Year:
2024
Event:
Presenters:
Yuan Liu
Paper Code:
SS-L24.5
 

Space debris detection and tracking, a key enabler for Space Situational Awareness (SSA), poses two inherent challenges: (1) small-sized targets (e.g., $1-10~cm$) posing detection difficulties for conventional ground-based radars (GBRs) and optical measurements; (2) large number resulting in a costly tracking exercise. To address these, this work utilizes intersatellite link (ISL) in the emerging low earth orbit (LEO) constellations to opportunistically sense debris. The spatially dense-distributed debris is modeled as a cluster to reduce the number of quantities estimated. Using a stochastic geometry-based channel model, a nested expectation-based SAGE$^2$ is proposed, building on space-alternative-generation-estimation-maximization (SAGE) to estimate the cluster-based channel parameters. Finally, the debris clusters are localized using the ISL forming a bistatic sensing setup. Simulation results validate the proposed approach and show the proposed SAGE$^2$ is faster than the conventional SAGE in clustered multipath channels

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